<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>边框阴影</title>
    <style>
      div {
        width: 350px;
        height: 100px;
        background-color: rosybrown;
        text-align: center;
        padding: 10px 40px;
        box-shadow: 10px 10px 20px gray;
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>
